1 dnl Process this file with autoconf to produce a configure script.
2 dnl Note we do not use AC_PREREQ here! See aclocal.m4 for what we use instead.
3 AC_INIT([GNU C Library], [(see version.h)], [http://sourceware.org/bugzilla/], [glibc])
4 AC_CONFIG_SRCDIR([include/features.h])
5 AC_CONFIG_HEADERS([config.h])
6 AC_CONFIG_AUX_DIR([scripts])
8 ACX_PKGVERSION([GNU libc])
9 ACX_BUGURL([http://www.gnu.org/software/libc/bugs.html])
10 AC_DEFINE_UNQUOTED([PKGVERSION], ["$PKGVERSION"],
11 [Package description])
12 AC_DEFINE_UNQUOTED([REPORT_BUGS_TO], ["$REPORT_BUGS_TO"],
13 [Bug reporting address])
15 # Glibc should not depend on any header files
16 AC_DEFUN([_AC_INCLUDES_DEFAULT_REQUIREMENTS],
17 [m4_divert_text([DEFAULTS],
18 [ac_includes_default='/* none */'])])
20 # We require GCC, and by default use its preprocessor. Override AC_PROG_CPP
21 # here to work around the Autoconf issue discussed in
22 # <http://sourceware.org/ml/libc-alpha/2013-01/msg00721.html>.
23 AC_DEFUN([AC_PROG_CPP],
24 [AC_REQUIRE([AC_PROG_CC])dnl
25 AC_ARG_VAR([CPP], [C preprocessor])dnl
26 _AC_ARG_VAR_CPPFLAGS()dnl
27 # On Suns, sometimes $CPP names a directory.
28 if test -n "$CPP" && test -d "$CPP"; then
31 if test -z "$CPP"; then
37 # We require GCC. Override _AC_PROG_CC_C89 here to work around the Autoconf
39 # <http://sourceware.org/ml/libc-alpha/2013-01/msg00757.html>.
40 AC_DEFUN([_AC_PROG_CC_C89], [[$1]])
42 dnl This is here so we can set $subdirs directly based on configure fragments.
48 if test $host != $build; then
49 AC_CHECK_PROGS(BUILD_CC, gcc cc)
51 AC_SUBST(cross_compiling)
53 AC_CHECK_TOOL(READELF, readelf, false)
55 # We need the C++ compiler only for testing.
57 # It's useless to us if it can't link programs (e.g. missing -lstdc++).
58 AC_CACHE_CHECK([whether $CXX can link programs], libc_cv_cxx_link_ok, [dnl
60 AC_LINK_IFELSE([AC_LANG_PROGRAM([], [])],
61 [libc_cv_cxx_link_ok=yes],
62 [libc_cv_cxx_link_ok=no])
64 AS_IF([test $libc_cv_cxx_link_ok != yes], [CXX=])
66 if test "`cd $srcdir; /bin/pwd`" = "`/bin/pwd`"; then
67 AC_MSG_ERROR([you must configure in a separate build directory])
70 # This will get text that should go into config.make.
73 # Check for a --with-gd argument and set libgd-LDFLAGS in config.make.
75 AC_HELP_STRING([--with-gd=DIR],
76 [find libgd include dir and library with prefix DIR]),
80 *) libgd_include="-I$withval/include"
81 libgd_ldflags="-L$withval/lib" ;;
84 AC_ARG_WITH([gd-include],
85 AC_HELP_STRING([--with-gd-include=DIR],
86 [find libgd include files in DIR]),
88 case "$with_gd_include" in
90 *) libgd_include="-I$withval" ;;
94 AC_HELP_STRING([--with-gd-lib=DIR],
95 [find libgd library files in DIR]),
97 case "$with_gd_lib" in
99 *) libgd_ldflags="-L$withval" ;;
103 if test -n "$libgd_include"; then
104 config_vars="$config_vars
105 CFLAGS-memusagestat.c = $libgd_include"
107 if test -n "$libgd_ldflags"; then
108 config_vars="$config_vars
109 libgd-LDFLAGS = $libgd_ldflags"
112 dnl Arguments to specify presence of other packages/features.
114 AC_HELP_STRING([--with-fp],
115 [if using floating-point hardware @<:@default=yes@:>@]),
119 AC_ARG_WITH([binutils],
120 AC_HELP_STRING([--with-binutils=PATH],
121 [specify location of binutils (as and ld)]),
122 [path_binutils=$withval],
124 AC_ARG_WITH([selinux],
125 AC_HELP_STRING([--with-selinux],
126 [if building with SELinux support]),
127 [with_selinux=$withval],
130 AC_ARG_WITH([headers],
131 AC_HELP_STRING([--with-headers=PATH],
132 [location of system headers to use
133 (for example /usr/src/linux/include)
134 @<:@default=compiler default@:>@]),
135 [sysheaders=$withval],
139 AC_SUBST(use_default_link)
140 AC_ARG_WITH([default-link],
141 AC_HELP_STRING([--with-default-link],
142 [do not use explicit linker scripts]),
143 [use_default_link=$withval],
144 [use_default_link=default])
146 AC_ARG_ENABLE([sanity-checks],
147 AC_HELP_STRING([--disable-sanity-checks],
148 [really do not use threads (should not be used except in special situations) @<:@default=yes@:>@]),
149 [enable_sanity=$enableval],
152 AC_ARG_ENABLE([shared],
153 AC_HELP_STRING([--enable-shared],
154 [build shared library @<:@default=yes if GNU ld@:>@]),
157 AC_ARG_ENABLE([profile],
158 AC_HELP_STRING([--enable-profile],
159 [build profiled library @<:@default=no@:>@]),
160 [profile=$enableval],
162 AC_ARG_ENABLE([timezone-tools],
163 AC_HELP_STRING([--disable-timezone-tools],
164 [do not install timezone tools (if using external ones) @<:@default=install@:>@]),
165 [enable_timezone_tools=$enableval],
166 [enable_timezone_tools=yes])
167 AC_SUBST(enable_timezone_tools)
169 AC_ARG_ENABLE([hardcoded-path-in-tests],
170 AC_HELP_STRING([--enable-hardcoded-path-in-tests],
171 [hardcode newly built glibc path in tests @<:@default=no@:>@]),
172 [hardcoded_path_in_tests=$enableval],
173 [hardcoded_path_in_tests=no])
174 AC_SUBST(hardcoded_path_in_tests)
176 AC_ARG_ENABLE([stackguard-randomization],
177 AC_HELP_STRING([--enable-stackguard-randomization],
178 [initialize __stack_chk_guard canary with a random number at program start]),
179 [enable_stackguard_randomize=$enableval],
180 [enable_stackguard_randomize=no])
181 if test "$enable_stackguard_randomize" = yes; then
182 AC_DEFINE(ENABLE_STACKGUARD_RANDOMIZE)
185 AC_ARG_ENABLE([lock-elision],
186 AC_HELP_STRING([--enable-lock-elision[=yes/no]],
187 [Enable lock elision for pthread mutexes by default]),
188 [enable_lock_elision=$enableval],
189 [enable_lock_elision=no])
190 AC_SUBST(enable_lock_elision)
191 if test "$enable_lock_elision" = yes ; then
192 AC_DEFINE(ENABLE_LOCK_ELISION)
195 dnl Generic infrastructure for drop-in additions to libc.
196 AC_ARG_ENABLE([add-ons],
197 AC_HELP_STRING([--enable-add-ons@<:@=DIRS...@:>@],
198 [configure and build add-ons in DIR1,DIR2,...
199 search for add-ons if no parameter given]),
200 , [enable_add_ons=yes])
202 AC_ARG_ENABLE([hidden-plt],
203 AC_HELP_STRING([--disable-hidden-plt],
204 [do not hide internal function calls to avoid PLT]),
207 if test "x$hidden" = xno; then
211 AC_ARG_ENABLE([bind-now],
212 AC_HELP_STRING([--enable-bind-now],
213 [disable lazy relocations in DSOs]),
214 [bindnow=$enableval],
218 dnl On some platforms we cannot use dynamic loading. We must provide
219 dnl static NSS modules.
220 AC_ARG_ENABLE([static-nss],
221 AC_HELP_STRING([--enable-static-nss],
222 [build static NSS modules @<:@default=no@:>@]),
223 [static_nss=$enableval],
225 dnl Enable static NSS also if we build no shared objects.
226 if test x"$static_nss" = xyes || test x"$shared" = xno; then
228 AC_DEFINE(DO_STATIC_NSS)
231 AC_ARG_ENABLE([force-install],
232 AC_HELP_STRING([--disable-force-install],
233 [don't force installation of files from this package, even if they are older than the installed files]),
234 [force_install=$enableval],
236 AC_SUBST(force_install)
238 AC_ARG_ENABLE([maintainer-mode],
239 AC_HELP_STRING([--enable-maintainer-mode],
240 [enable make rules and dependencies not useful (and sometimes confusing) to the casual installer]),
241 [maintainer=$enableval],
244 dnl On some platforms we allow dropping compatibility with all kernel
246 AC_ARG_ENABLE([kernel],
247 AC_HELP_STRING([--enable-kernel=VERSION],
248 [compile for compatibility with kernel not older than VERSION]),
249 [minimum_kernel=$enableval],
251 dnl Prevent unreasonable values.
252 if test "$minimum_kernel" = yes || test "$minimum_kernel" = no; then
253 # Better nothing than this.
256 if test "$minimum_kernel" = current; then
257 minimum_kernel=`uname -r 2>/dev/null` || minimum_kernel=
261 dnl For the development we sometimes want gcc to issue even more warnings.
262 dnl This is not the default since many of the extra warnings are not
264 AC_ARG_ENABLE([all-warnings],
265 AC_HELP_STRING([--enable-all-warnings],
266 [enable all useful warnings gcc can issue]),
267 [all_warnings=$enableval],
269 AC_SUBST(all_warnings)
271 AC_ARG_ENABLE([werror],
272 AC_HELP_STRING([--disable-werror],
273 [do not build with -Werror]),
274 [enable_werror=$enableval],
276 AC_SUBST(enable_werror)
278 AC_ARG_ENABLE([multi-arch],
279 AC_HELP_STRING([--enable-multi-arch],
280 [enable single DSO with optimizations for multiple architectures]),
281 [multi_arch=$enableval],
282 [multi_arch=default])
284 AC_ARG_ENABLE([nss-crypt],
285 AC_HELP_STRING([--enable-nss-crypt],
286 [enable libcrypt to use nss]),
287 [nss_crypt=$enableval],
289 if test x$nss_crypt = xyes; then
290 nss_includes=-I$(nss-config --includedir 2>/dev/null)
291 if test $? -ne 0; then
292 AC_MSG_ERROR([cannot find include directory with nss-config])
295 CFLAGS="$CFLAGS $nss_includes"
296 AC_COMPILE_IFELSE([AC_LANG_PROGRAM([typedef int PRBool;
298 #include <nsslowhash.h>
299 void f (void) { NSSLOW_Init (); }])],
300 libc_cv_nss_crypt=yes,
302 cannot find NSS headers with lowlevel hash function interfaces]))
304 LIBS="$LIBS -lfreebl3"
305 AC_LINK_IFELSE([AC_LANG_PROGRAM([typedef int PRBool;
307 #include <nsslowhash.h>],
309 libc_cv_nss_crypt=yes,
311 cannot link program using lowlevel NSS hash functions]))
317 AC_SUBST(libc_cv_nss_crypt)
320 AC_ARG_ENABLE([obsolete-rpc],
321 AC_HELP_STRING([--enable-obsolete-rpc],
322 [build and install the obsolete RPC code for link-time usage]),
323 [link_obsolete_rpc=$enableval],
324 [link_obsolete_rpc=no])
325 AC_SUBST(link_obsolete_rpc)
327 if test "$link_obsolete_rpc" = yes; then
328 AC_DEFINE(LINK_OBSOLETE_RPC)
331 AC_ARG_ENABLE([systemtap],
332 [AS_HELP_STRING([--enable-systemtap],
333 [enable systemtap static probe points @<:@default=no@:>@])],
334 [systemtap=$enableval],
336 if test "x$systemtap" != xno; then
337 AC_CACHE_CHECK([for systemtap static probe support], libc_cv_sdt, [dnl
339 CFLAGS="-std=gnu99 $CFLAGS"
340 AC_COMPILE_IFELSE([AC_LANG_SOURCE([[#include <sys/sdt.h>
341 void foo (int i, void *p)
343 asm ("" STAP_PROBE_ASM (foo, bar, STAP_PROBE_ASM_TEMPLATE (2)) ""
344 :: STAP_PROBE_ASM_OPERANDS (2, i, p));
345 }]])], [libc_cv_sdt=yes], [libc_cv_sdt=no])
346 CFLAGS="$old_CFLAGS"])
347 if test $libc_cv_sdt = yes; then
348 AC_DEFINE([USE_STAP_PROBE])
349 elif test "x$systemtap" != xauto; then
350 AC_MSG_FAILURE([systemtap support needs sys/sdt.h with asm support])
354 AC_ARG_ENABLE([build-nscd],
355 [AS_HELP_STRING([--disable-build-nscd],
356 [disable building and installing the nscd daemon])],
357 [build_nscd=$enableval],
358 [build_nscd=default])
361 # Note the use of $use_nscd is near the bottom of the file.
362 AC_ARG_ENABLE([nscd],
363 [AS_HELP_STRING([--disable-nscd],
364 [library functions will not contact the nscd daemon])],
365 [use_nscd=$enableval],
368 AC_ARG_ENABLE([pt_chown],
369 [AS_HELP_STRING([--enable-pt_chown],
370 [Enable building and installing pt_chown])],
371 [build_pt_chown=$enableval],
373 AC_SUBST(build_pt_chown)
374 if test "$build_pt_chown" = yes; then
375 AC_DEFINE(HAVE_PT_CHOWN)
378 # The abi-tags file uses a fairly simplistic model for name recognition that
379 # can't distinguish i486-pc-linux-gnu fully from i486-pc-gnu. So we mutate a
380 # $host_os of `gnu*' here to be `gnu-gnu*' just so that it can tell.
381 # This doesn't get used much beyond that, so it's fairly safe.
386 host_os=`echo $host_os | sed -e 's/gnu/gnu-gnu/'`
390 AC_ARG_ENABLE([mathvec],
391 [AS_HELP_STRING([--enable-mathvec],
392 [Enable building and installing mathvec @<:@default depends on architecture@:>@])],
393 [build_mathvec=$enableval],
394 [build_mathvec=notset])
396 # We keep the original values in `$config_*' and never modify them, so we
397 # can write them unchanged into config.make. Everything else uses
398 # $machine, $vendor, and $os, and changes them whenever convenient.
399 config_machine=$host_cpu config_vendor=$host_vendor config_os=$host_os
401 # Don't allow vendor == "unknown"
402 test "$config_vendor" = unknown && config_vendor=
403 config_os="`echo $config_os | sed 's/^unknown-//'`"
405 # Some configurations imply other options.
408 # The configure fragment of an add-on port can modify these to supplement
409 # or override the table in the case statement below. No fragment should
410 # ever change the config_* variables, however.
411 machine=$config_machine
412 vendor=$config_vendor
418 AS_HELP_STRING([--with-cpu=CPU], [select code for CPU variant]),
421 yes|'') AC_MSG_ERROR([--with-cpu requires an argument]) ;;
423 *) submachine="$withval" ;;
427 # An preconfigure script can set this when it wants to disable the sanity
431 dnl Let sysdeps/*/preconfigure act here, like they can in add-ons.
432 LIBC_PRECONFIGURE([$srcdir], [for sysdeps])
434 dnl Having this here, though empty, makes sure that if add-ons' fragments
435 dnl do AC_CONFIG_SUBDIRS([some-dir]), which just sets $subdirs, then
436 dnl our AC_OUTPUT will actually use it.
439 case "$enable_add_ons" in
442 add_ons=`cd $srcdir && ls -d 2> /dev/null */configure */sysdeps |
443 sed 's@/[[^/]]*$@@' | sort | uniq`
444 add_ons_automatic=yes
446 *) add_ons=`echo "$enable_add_ons" | sed 's/,/ /g'`
447 add_ons_automatic=no ;;
453 if test x"$add_ons" != x; then
454 for f in $add_ons; do
459 *** It seems that you're using an old \`crypt' add-on. crypt is now
460 *** part of glibc and using the old add-on will not work with this
461 *** release. Start again with fresh sources and without the old
462 *** \`crypt' add-on.])
466 *** It seems that you're using an old \`localedata' add-on. localedata
467 *** is now part of glibc and using the old add-on will not work with
468 *** this release. Start again with fresh sources and without the old
469 *** \`localedata' add-on.])
474 # Now source each add-on's configure fragment.
475 # The fragments can use $srcdir/$libc_add_on to find themselves,
476 # and test $add_ons_automatic to see if they were explicitly requested.
477 # A fragment can clear (or even change) $libc_add_on to affect
478 # whether it goes into the list to be actually used in the build.
480 for libc_add_on in $add_ons; do
481 # Test whether such a directory really exists.
482 # It can be absolute, or relative to $srcdir, or relative to the build dir.
483 case "$libc_add_on" in
485 libc_add_on_srcdir=$libc_add_on
488 test -d "$srcdir/$libc_add_on" || {
489 if test -d "$libc_add_on"; then
490 libc_add_on="`pwd`/$libc_add_on"
492 AC_MSG_ERROR(add-on directory \"$libc_add_on\" does not exist)
495 libc_add_on_srcdir=$srcdir/$libc_add_on
499 libc_add_on_frag=$libc_add_on_srcdir/configure
500 libc_add_on_canonical=
501 libc_add_on_config_subdirs=
502 if test -r "$libc_add_on_frag"; then
503 AC_MSG_NOTICE(running configure fragment for add-on $libc_add_on)
504 libc_add_on_canonical=unknown
506 . "$libc_add_on_frag"
507 test -z "$libc_add_on" || {
508 configured_add_ons="$configured_add_ons $libc_add_on"
509 if test "x$libc_add_on_canonical" = xunknown; then
510 AC_MSG_ERROR(fragment must set \$libc_add_on_canonical)
512 for d in $libc_add_on_subdirs; do
513 case "$libc_add_on" in
514 /*) subdir_srcdir="$libc_add_on" ;;
515 *) subdir_srcdir="\$(..)$libc_add_on" ;;
519 d="${libc_add_on_canonical:-$libc_add_on}"
525 subdir_srcdir="$subdir_srcdir/$d"
528 d=`echo "$d" | sed 's@/*$@@;s@^.*/@@'`
529 add_on_subdirs="$add_on_subdirs $d"
530 test "$subdir_srcdir" = "\$(..)$d" || config_vars="$config_vars
531 $d-srcdir = $subdir_srcdir"
533 for d in $libc_add_on_config_subdirs; do
536 fragment uses absolute path in \$libc_add_on_config_subdirs) ;;
538 if test ! -d "$libc_add_on_srcdir/$d"; then
539 AC_MSG_ERROR(fragment wants to configure missing directory $d)
541 case "$libc_add_on" in
543 relative path required for add-on using \$libc_add_on_config_subdirs) ;;
545 subdirs="$subdirs $libc_add_on/$d"
549 if test -n "$libc_add_on"; then
550 LIBC_PRECONFIGURE([$libc_add_on_srcdir], [add-on $libc_add_on for])
551 use_add_ons="$use_add_ons $libc_add_on"
552 add_ons_pfx="$add_ons_pfx $libc_add_on/"
553 test -z "$libc_add_on_canonical" ||
554 add_ons_sfx="$add_ons_sfx /$libc_add_on_canonical"
557 # Use echo to strip excess whitespace.
558 add_ons="`echo $use_add_ons`"
561 AC_SUBST(add_on_subdirs)
565 ### I put this here to prevent those annoying emails from people who cannot
566 ### read and try to compile glibc on unsupported platforms. --drepper
568 ### By using the undocumented --enable-hacker-mode option for configure
569 ### one can skip this test to make the configuration not fail for unsupported
572 if test -z "$enable_hacker_mode" && test x"$libc_config_ok" != xyes; then
573 case "$machine-$host_os" in
577 echo "*** The GNU C library is currently not available for this platform."
578 echo "*** So far nobody cared to port it and if there is no volunteer it"
579 echo "*** might never happen. So, if you have interest to see glibc on"
580 echo "*** this platform visit"
581 echo "*** http://www.gnu.org/software/libc/porting.html"
582 echo "*** and join the group of porters"
588 # Set base_machine if not set by a preconfigure fragment.
589 test -n "$base_machine" || base_machine=$machine
590 AC_SUBST(base_machine)
592 # For the multi-arch option we need support in the assembler & linker.
593 AC_CACHE_CHECK([for assembler and linker STT_GNU_IFUNC support],
594 libc_cv_ld_gnu_indirect_function, [dnl
595 cat > conftest.S <<EOF
596 .type foo,%gnu_indirect_function
609 libc_cv_ld_gnu_indirect_function=no
610 if ${CC-cc} $CFLAGS $CPPFLAGS $LDFLAGS \
611 -nostartfiles -nostdlib \
612 -o conftest conftest.S 1>&AS_MESSAGE_LOG_FD 2>&AS_MESSAGE_LOG_FD; then
613 # Do a link to see if the backend supports IFUNC relocs.
614 $READELF -r conftest 1>&AS_MESSAGE_LOG_FD
615 LC_ALL=C $READELF -r conftest | grep 'no relocations' >/dev/null || {
616 libc_cv_ld_gnu_indirect_function=yes
621 AC_MSG_CHECKING(whether .text pseudo-op must be used)
622 AC_CACHE_VAL(libc_cv_dot_text, [dnl
623 cat > conftest.s <<EOF
627 if AC_TRY_COMMAND(${CC-cc} $ASFLAGS -c conftest.s 1>&AS_MESSAGE_LOG_FD); then
628 libc_cv_dot_text=.text
631 if test -z "$libc_cv_dot_text"; then
637 if test x"$libc_cv_ld_gnu_indirect_function" != xyes; then
638 if test x"$multi_arch" = xyes; then
639 AC_MSG_ERROR([--enable-multi-arch support requires assembler and linker support])
645 if test x"$multi_arch" != xno; then
646 multi_arch_d=/multiarch
649 # Compute the list of sysdep directories for this configuration.
650 # This can take a while to compute.
651 sysdep_dir=$srcdir/sysdeps
652 AC_MSG_CHECKING(sysdep dirs)
653 dnl We need to use [ and ] for other purposes for a while now.
655 # Make sco3.2v4 become sco3.2.4 and sunos4.1.1_U1 become sunos4.1.1.U1.
656 os="`echo $os | sed 's/\([0-9A-Z]\)[v_]\([0-9A-Z]\)/\1.\2/g'`"
658 test "x$base_os" != x || case "$os" in
665 # For sunos4.1.1, try sunos4.1.1, then sunos4.1, then sunos4, then sunos.
668 while o=`echo $tail | sed 's/\.[^.]*$//'`; test $o != $tail; do
672 o=`echo $tail | sed 's/[0-9]*$//'`
673 if test $o != $tail; then
676 # For linux-gnu, try linux-gnu, then linux.
677 o=`echo $tail | sed 's/-.*$//'`
678 if test $o != $tail; then
682 # For unix/sysv/sysv4, try unix/sysv/sysv4, then unix/sysv, then unix.
685 while b=`echo $tail | sed 's@^\(.*\)/\([^/]*\)$@& \1@'`; test -n "$b"; do
691 # For sparc/sparc32, try sparc/sparc32 and then sparc.
693 tail=$machine${submachine:+/$submachine}
694 while m=`echo $tail | sed 's@^\(.*\)/\([^/]*\)$@& \1@'`; test -n "$m"; do
696 # Prepend the machine's FPU directory unless --without-fp.
697 if test "$with_fp" = yes; then
702 # For each machine term, try it with and then without /multiarch.
703 for try_fpu in $maybe_fpu ''; do
704 for try_multi in $multi_arch_d ''; do
705 mach="$mach /$1$try_fpu$try_multi"
711 dnl We are done with glob and regexp uses of [ and ]; return to autoconf.
714 # Find what sysdep directories exist.
717 for b in $base ''; do
718 for m0 in $mach ''; do
719 for v in /$vendor ''; do
720 test "$v" = / && continue
721 for o in /$ostry ''; do
722 test "$o" = / && continue
723 for m in $mach ''; do
724 for d in $add_ons_pfx ''; do
725 for a in $add_ons_sfx ''; do
726 try_suffix="$m0$b$v$o$m"
727 if test -n "$try_suffix"; then
728 try_srcdir="${srcdir}/"
732 try="${d}sysdeps$try_suffix$a"
733 test -n "$enable_debug_configure" &&
734 echo "$0 [DEBUG]: try $try" >&2
735 if test -d "$try_srcdir$try"; then
736 sysnames="$sysnames $try"
737 { test -n "$o" || test -n "$b"; } && os_used=t
738 { test -n "$m" || test -n "$m0"; } && machine_used=t
740 x*/$submachine) submachine_used=t ;;
742 if test -n "$d"; then
743 case "$sysnames_add_ons" in
745 *|'') sysnames_add_ons="$sysnames_add_ons $d" ;;
758 # If the assembler supports gnu_indirect_function symbol type and the
759 # architecture supports multi-arch, we enable multi-arch by default.
760 case $sysnames_add_ons$sysnames in
764 test x"$multi_arch" = xdefault && multi_arch=no
767 if test x"$multi_arch" != xno; then
768 AC_DEFINE(USE_MULTIARCH)
772 if test -z "$os_used" && test "$os" != none; then
773 AC_MSG_ERROR(Operating system $os is not supported.)
775 if test -z "$machine_used" && test "$machine" != none; then
776 AC_MSG_ERROR(The $machine is not supported.)
778 if test -z "$submachine_used" && test -n "$submachine"; then
779 AC_MSG_ERROR(The $submachine subspecies of $host_cpu is not supported.)
783 # We have now validated the configuration.
785 # Expand the list of system names into a full list of directories
786 # from each element's parent name and Implies file (if present).
789 while test $# -gt 0; do
793 case " $names " in *" $name "*)
794 # Already in the list.
798 # Report each name as we discover it, so there is no long pause in output.
799 echo $ECHO_N "$name $ECHO_C" >&AS_MESSAGE_FD
801 name_base=`echo $name | sed -e 's@\(.*sysdeps\)/.*@\1@'`
805 *) xsrcdir=$srcdir/ ;;
807 test -n "$enable_debug_configure" &&
808 echo "[DEBUG]: name/Implies $xsrcdir$name/Implies" >&2
810 for implies_file in Implies Implies-before Implies-after; do
811 implies_type=`echo $implies_file | sed s/-/_/`
812 eval ${implies_type}=
813 if test -f $xsrcdir$name/$implies_file; then
814 # Collect more names from the `Implies' file (removing comments).
815 implied_candidate="`sed 's/#.*$//' < $xsrcdir$name/$implies_file`"
816 for x in $implied_candidate; do
818 if test -d $xsrcdir$name_base/$x; then
819 eval "${implies_type}=\"\$${implies_type} \$name_base/\$x\""
822 for d in $add_ons_pfx ''; do
826 *) try_srcdir=$srcdir/ ;;
828 test -n "$enable_debug_configure" &&
829 echo "[DEBUG]: $name $implies_file $x try($d) {$try_srcdir}$try" >&2
830 if test $try != $xsrcdir$name_base/$x && test -d $try_srcdir$try;
832 eval "${implies_type}=\"\$${implies_type} \$try\""
834 case "$sysnames_add_ons" in
836 *|'') sysnames_add_ons="$sysnames_add_ons $d" ;;
840 if test $found = no; then
841 AC_MSG_WARN($name/$implies_file specifies nonexistent $x)
847 # Add NAME to the list of names.
850 # Find the parent of NAME, using the empty string if it has none.
852 parent="`echo $name | sed -n -e 's=/[^/]*$==' -e '/sysdeps$/q' -e p`"
855 test -n "$enable_debug_configure" &&
856 echo "[DEBUG]: $name Implies='$Implies' rest='$*' parent='$parent' \
857 Implies_before='$Implies_before' Implies_after='$Implies_after'" >&2
859 # Add the names implied by NAME, and NAME's parent (if it has one), to
860 # the list of names to be processed (the argument list). We prepend the
861 # implied names to the list and append the parent. We want implied
862 # directories to come before further directories inferred from the
863 # configuration components; this ensures that for sysv4, unix/common
864 # (implied by unix/sysv/sysv4) comes before unix/sysv (in ostry (here $*)
866 sysnames="`echo $Implies $* $Implies_before $parent $Implies_after`"
867 test -n "$sysnames" && set $sysnames
870 # Add the default directories.
871 default_sysnames="sysdeps/generic"
872 sysnames="$names $default_sysnames"
874 # The other names were emitted during the scan.
875 AC_MSG_RESULT($default_sysnames)
877 # Collect the list of add-ons that supply partial sysdeps trees.
879 for add_on in $add_ons; do
882 *) xsrcdir="$srcdir/" ;;
885 test -d "$xsrcdir$add_on/sysdeps" || {
886 case "$configured_add_ons " in
889 AC_MSG_ERROR(add-on $add_on has no configure fragment or sysdeps tree)
895 sysdeps_add_ons="$sysdeps_add_ons $add_on"
896 case "$sysnames_add_ons" in
899 AC_MSG_WARN(add-on $add_on contributed no sysdeps directories)
904 for d in $sysnames; do
906 $add_on/sysdeps/*) ;;
909 (cd "$xsrcdir$d" && for f in *[[!~]]; do
913 test -d "$ff" || { test -e "$ff" && exit 88; }
917 test -d "$f" || { test -e "$f" && exit 88; }
921 if test $? -eq 88; then
926 if test $found = no; then
927 AC_MSG_WARN(add-on $add_on contributed no useful sysdeps directories)
930 AC_SUBST(sysdeps_add_ons)
936 if test "$INSTALL" = "${srcdir}/scripts/install-sh -c"; then
937 # The makefiles need to use a different form to find it in $srcdir.
938 INSTALL='\$(..)./scripts/install-sh -c'
944 # Accept binutils 2.22 or newer.
945 AC_CHECK_PROG_VER(AS, $AS, --version,
946 [GNU assembler.* \([0-9]*\.[0-9.]*\)],
947 [2.1[0-9][0-9]*|2.2[2-9]*|2.[3-9][0-9]*|[3-9].*|[1-9][0-9]*],
948 AS=: critic_missing="$critic_missing as")
949 AC_CHECK_PROG_VER(LD, $LD, --version,
950 [GNU ld.* \([0-9][0-9]*\.[0-9.]*\)],
951 [2.1[0-9][0-9]*|2.2[2-9]*|2.[3-9][0-9]*|[3-9].*|[1-9][0-9]*],
952 LD=: critic_missing="$critic_missing ld")
954 # These programs are version sensitive.
956 AC_CHECK_PROG_VER(MAKE, gnumake gmake make, --version,
957 [GNU Make[^0-9]*\([0-9][0-9.]*\)],
958 [3.79* | 3.[89]* | [4-9].* | [1-9][0-9]*], critic_missing="$critic_missing make")
960 AC_CHECK_PROG_VER(MSGFMT, gnumsgfmt gmsgfmt msgfmt, --version,
961 [GNU gettext.* \([0-9]*\.[0-9.]*\)],
962 [0.10.3[6-9]* | 0.10.[4-9][0-9]* | 0.1[1-9]* | 0.[2-9][0-9]* | [1-9].*],
963 MSGFMT=: aux_missing="$aux_missing msgfmt")
964 AC_CHECK_PROG_VER(MAKEINFO, makeinfo, --version,
965 [GNU texinfo.* \([0-9][0-9.]*\)],
966 [4.[7-9]*|4.[1-9][0-9]*|[5-9].*],
967 MAKEINFO=: aux_missing="$aux_missing makeinfo")
968 AC_CHECK_PROG_VER(SED, sed, --version,
969 [GNU sed[^0-9]* \([0-9]*\.[0-9.]*\)],
970 [3.0[2-9]*|3.[1-9]*|[4-9]*],
971 SED=: aux_missing="$aux_missing sed")
972 AC_CHECK_PROG_VER(AWK, gawk, --version,
973 [GNU Awk[^0-9]*\([0-9][0-9.]*\)],
974 [3.1.[2-9]*|3.[2-9]*|[4-9]*], critic_missing="$critic_missing gawk")
976 AC_CACHE_CHECK([if $CC is sufficient to build libc], libc_cv_compiler_ok, [
978 #if !defined __GNUC__ || __GNUC__ < 4 || (__GNUC__ == 4 && __GNUC_MINOR__ < 6)
979 #error insufficient compiler
981 [libc_cv_compiler_ok=yes],
982 [libc_cv_compiler_ok=no])])
983 AS_IF([test $libc_cv_compiler_ok != yes],
984 [critic_missing="$critic_missing compiler"])
986 AC_CHECK_TOOL(NM, nm, false)
988 if test "x$maintainer" = "xyes"; then
989 AC_CHECK_PROGS(AUTOCONF, autoconf, no)
991 xno|x|x:) AUTOCONF=no ;;
994 whether $AUTOCONF${ACFLAGS:+ }$ACFLAGS works, libc_cv_autoconf_works, [dnl
995 if (cd $srcdir; $AUTOCONF $ACFLAGS configure.ac > /dev/null 2>&1); then
996 libc_cv_autoconf_works=yes
998 libc_cv_autoconf_works=no
1000 test $libc_cv_autoconf_works = yes || AUTOCONF=no
1003 if test "x$AUTOCONF" = xno; then
1004 aux_missing="$aux_missing autoconf"
1010 test -n "$critic_missing" && AC_MSG_ERROR([
1011 *** These critical programs are missing or too old:$critic_missing
1012 *** Check the INSTALL file for required versions.])
1014 test -n "$aux_missing" && AC_MSG_WARN([
1015 *** These auxiliary programs are missing or incompatible versions:$aux_missing
1016 *** some features will be disabled.
1017 *** Check the INSTALL file for required versions.])
1019 # if using special system headers, find out the compiler's sekrit
1020 # header directory and add that to the list. NOTE: Only does the right
1021 # thing on a system that doesn't need fixincludes. (Not presently a problem.)
1022 if test -n "$sysheaders"; then
1023 SYSINCLUDES=-nostdinc
1024 for d in include include-fixed; do
1025 i=`$CC -print-file-name="$d"` && test "x$i" != x && test "x$i" != "x$d" &&
1026 SYSINCLUDES="$SYSINCLUDES -isystem $i"
1028 SYSINCLUDES="$SYSINCLUDES \
1029 -isystem `echo $sysheaders | sed 's/:/ -isystem /g'`"
1030 if test -n "$CXX"; then
1032 for cxxheaders in `$CXX -v -S -x c++ /dev/null -o /dev/null 2>&1 \
1033 | sed -n -e '1,/#include/d' -e 's/^ \(\/.*\/[cg]++\)/\1/p'`; do
1034 test "x$cxxheaders" != x &&
1035 CXX_SYSINCLUDES="$CXX_SYSINCLUDES -isystem $cxxheaders"
1039 AC_SUBST(SYSINCLUDES)
1040 AC_SUBST(CXX_SYSINCLUDES)
1042 # Test if LD_LIBRARY_PATH contains the notation for the current directory
1043 # since this would lead to problems installing/building glibc.
1044 # LD_LIBRARY_PATH contains the current directory if one of the following
1046 # - one of the terminals (":" and ";") is the first or last sign
1047 # - two terminals occur directly after each other
1048 # - the path contains an element with a dot in it
1049 AC_MSG_CHECKING(LD_LIBRARY_PATH variable)
1051 case ${LD_LIBRARY_PATH} in
1052 [:\;]* | *[:\;] | *[:\;][:\;]* | *[:\;]. | .[:\;]*| . | *[:\;].[:\;]* )
1053 ld_library_path_setting="contains current directory"
1056 ld_library_path_setting="ok"
1060 AC_MSG_RESULT($ld_library_path_setting)
1061 if test "$ld_library_path_setting" != "ok"; then
1063 *** LD_LIBRARY_PATH shouldn't contain the current directory when
1064 *** building glibc. Please change the environment variable
1065 *** and run configure again.])
1068 AC_CACHE_CHECK(whether GCC supports -static-libgcc, libc_cv_gcc_static_libgcc, [dnl
1069 if $CC -v -static-libgcc 2>&1 | grep 'unrecognized option.*static-libgcc' >/dev/null; then
1070 libc_cv_gcc_static_libgcc=
1072 libc_cv_gcc_static_libgcc=-static-libgcc
1074 AC_SUBST(libc_cv_gcc_static_libgcc)
1076 AC_PATH_PROG(BASH_SHELL, bash, no)
1078 AC_PATH_PROG(PERL, perl, no)
1079 if test "$PERL" != no &&
1080 (eval `$PERL -V:apiversion`; test `expr "$apiversion" \< 5` -ne 0); then
1083 AC_PATH_PROG(INSTALL_INFO, install-info, no,
1084 $PATH:/usr/local/bin:/usr/local/sbin:/usr/bin:/usr/sbin:/bin:/sbin)
1085 AC_CHECK_PROG_VER(BISON, bison, --version,
1086 [bison (GNU Bison) \([0-9]*\.[0-9.]*\)],
1087 [2.7*|[3-9].*|[1-9][0-9]*],
1090 AC_CACHE_CHECK(whether we need to use -P to assemble .S files,
1091 libc_cv_need_minus_P, [dnl
1092 cat > conftest.S <<EOF
1093 #include "confdefs.h"
1094 /* Nothing whatsoever. */
1096 if AC_TRY_COMMAND(${CC-cc} $CPPFLAGS $ASFLAGS -c conftest.S 1>&AS_MESSAGE_LOG_FD); then
1097 libc_cv_need_minus_P=no
1099 libc_cv_need_minus_P=yes
1102 if test $libc_cv_need_minus_P = yes; then
1103 config_vars="$config_vars
1104 asm-CPPFLAGS = -P # The assembler can't grok cpp's # line directives."
1107 AC_CACHE_CHECK(for .set assembler directive, libc_cv_asm_set_directive, [dnl
1108 cat > conftest.s <<EOF
1111 .set glibc_conftest_frobozz,foo
1112 .globl glibc_conftest_frobozz
1114 # The alpha-dec-osf1 assembler gives only a warning for `.set'
1115 # (but it doesn't work), so we must do a linking check to be sure.
1116 cat > conftest1.c <<\EOF
1117 extern int glibc_conftest_frobozz;
1118 void _start() { glibc_conftest_frobozz = 1; }
1120 if ${CC-cc} $CFLAGS $CPPFLAGS $LDFLAGS \
1121 -nostartfiles -nostdlib \
1122 -o conftest conftest.s conftest1.c 1>&AS_MESSAGE_LOG_FD 2>&AS_MESSAGE_LOG_FD; then
1123 libc_cv_asm_set_directive=yes
1125 libc_cv_asm_set_directive=no
1128 if test $libc_cv_asm_set_directive = yes; then
1129 AC_DEFINE(HAVE_ASM_SET_DIRECTIVE)
1132 AC_CACHE_CHECK(for assembler gnu_unique_object symbol type,
1133 libc_cv_asm_unique_object, [dnl
1134 cat > conftest.s <<EOF
1137 .type _sym, %gnu_unique_object
1139 if ${CC-cc} -c $ASFLAGS conftest.s 1>&AS_MESSAGE_LOG_FD 2>&AS_MESSAGE_LOG_FD; then
1140 libc_cv_asm_unique_object=yes
1142 libc_cv_asm_unique_object=no
1145 if test $libc_cv_asm_unique_object = yes; then
1146 AC_DEFINE(HAVE_ASM_UNIQUE_OBJECT)
1149 AC_CACHE_CHECK(for .previous assembler directive,
1150 libc_cv_asm_previous_directive, [dnl
1151 cat > conftest.s <<EOF
1152 .section foo_section
1155 if AC_TRY_COMMAND(${CC-cc} -c $ASFLAGS conftest.s 1>&AS_MESSAGE_LOG_FD); then
1156 libc_cv_asm_previous_directive=yes
1158 libc_cv_asm_previous_directive=no
1161 if test $libc_cv_asm_previous_directive = yes; then
1162 AC_DEFINE(HAVE_ASM_PREVIOUS_DIRECTIVE)
1164 AC_CACHE_CHECK(for .popsection assembler directive,
1165 libc_cv_asm_popsection_directive, [dnl
1166 cat > conftest.s <<EOF
1167 .pushsection foo_section
1170 if AC_TRY_COMMAND(${CC-cc} -c $ASFLAGS conftest.s 1>&AS_MESSAGE_LOG_FD); then
1171 libc_cv_asm_popsection_directive=yes
1173 libc_cv_asm_popsection_directive=no
1176 if test $libc_cv_asm_popsection_directive = yes; then
1177 AC_DEFINE(HAVE_ASM_POPSECTION_DIRECTIVE)
1180 AC_CACHE_CHECK(for .protected and .hidden assembler directive,
1181 libc_cv_asm_protected_directive, [dnl
1182 cat > conftest.s <<EOF
1188 if AC_TRY_COMMAND(${CC-cc} -c $ASFLAGS conftest.s 1>&AS_MESSAGE_LOG_FD); then
1189 libc_cv_asm_protected_directive=yes
1191 AC_MSG_ERROR(assembler support for symbol visibility is required)
1195 if test $libc_cv_asm_protected_directive = yes; then
1196 AC_CACHE_CHECK(whether __attribute__((visibility())) is supported,
1197 libc_cv_visibility_attribute,
1198 [cat > conftest.c <<EOF
1199 int foo __attribute__ ((visibility ("hidden"))) = 1;
1200 int bar __attribute__ ((visibility ("protected"))) = 1;
1202 libc_cv_visibility_attribute=no
1203 if AC_TRY_COMMAND(${CC-cc} -Werror -S conftest.c -o conftest.s 1>&AS_MESSAGE_LOG_FD); then
1204 if grep '\.hidden.*foo' conftest.s >/dev/null; then
1205 if grep '\.protected.*bar' conftest.s >/dev/null; then
1206 libc_cv_visibility_attribute=yes
1210 rm -f conftest.{c,s}
1212 if test $libc_cv_visibility_attribute != yes; then
1213 AC_MSG_ERROR(compiler support for visibility attribute is required)
1217 if test $libc_cv_visibility_attribute = yes; then
1218 AC_CACHE_CHECK(linker support for protected data symbol,
1219 libc_cv_protected_data,
1220 [cat > conftest.c <<EOF
1221 int bar __attribute__ ((visibility ("protected"))) = 1;
1223 libc_cv_protected_data=no
1224 if AC_TRY_COMMAND(${CC-cc} -nostdlib -nostartfiles -fPIC -shared conftest.c -o conftest.so); then
1225 cat > conftest.c <<EOF
1227 int main (void) { return bar; }
1229 if AC_TRY_COMMAND(${CC-cc} -nostdlib -nostartfiles conftest.c -o conftest conftest.so); then
1230 libc_cv_protected_data=yes
1236 libc_cv_protected_data=no
1238 AC_SUBST(libc_cv_protected_data)
1240 if test $libc_cv_visibility_attribute = yes; then
1241 AC_CACHE_CHECK(for broken __attribute__((visibility())),
1242 libc_cv_broken_visibility_attribute,
1243 [cat > conftest.c <<EOF
1245 int bar (int x) __asm__ ("foo") __attribute__ ((visibility ("hidden")));
1246 int bar (int x) { return x; }
1248 libc_cv_broken_visibility_attribute=yes
1249 if AC_TRY_COMMAND(${CC-cc} -Werror -S conftest.c -o conftest.s 1>&AS_MESSAGE_LOG_FD); then
1251 if grep '\.hidden[ _]foo' conftest.s >/dev/null; then
1253 libc_cv_broken_visibility_attribute=no
1256 rm -f conftest.c conftest.s
1258 if test $libc_cv_broken_visibility_attribute = yes; then
1259 AC_MSG_ERROR(working compiler support for visibility attribute is required)
1263 AC_CACHE_CHECK(for broken __attribute__((alias())),
1264 libc_cv_broken_alias_attribute,
1265 [cat > conftest.c <<EOF
1266 extern int foo (int x) __asm ("xyzzy");
1267 int bar (int x) { return x; }
1268 extern __typeof (bar) foo __attribute ((weak, alias ("bar")));
1270 extern __typeof (dfoo) dfoo __asm ("abccb");
1273 libc_cv_broken_alias_attribute=yes
1274 if AC_TRY_COMMAND(${CC-cc} -Werror -S conftest.c -o conftest.s 1>&AS_MESSAGE_LOG_FD); then
1275 if grep 'xyzzy' conftest.s >/dev/null &&
1276 grep 'abccb' conftest.s >/dev/null; then
1277 libc_cv_broken_alias_attribute=no
1280 rm -f conftest.c conftest.s
1282 if test $libc_cv_broken_alias_attribute = yes; then
1283 AC_MSG_ERROR(working alias attribute support required)
1286 if test $libc_cv_visibility_attribute = yes; then
1287 AC_CACHE_CHECK(whether to put _rtld_local into .sdata section,
1288 libc_cv_have_sdata_section,
1289 [echo "int i;" > conftest.c
1290 libc_cv_have_sdata_section=no
1291 if ${CC-cc} $LDFLAGS -fPIC -shared -Wl,--verbose conftest.c -o conftest.so 2>&1 \
1292 | grep '\.sdata' >/dev/null; then
1293 libc_cv_have_sdata_section=yes
1295 rm -f conftest.c conftest.so
1297 if test $libc_cv_have_sdata_section = yes; then
1298 AC_DEFINE(HAVE_SDATA_SECTION)
1302 AC_CACHE_CHECK(for .preinit_array/.init_array/.fini_array support,
1303 libc_cv_initfini_array, [dnl
1304 LIBC_TRY_LINK_STATIC([
1305 int foo (void) { return 1; }
1306 int (*fp) (void) __attribute__ ((section (".init_array"))) = foo;
1308 [if $READELF -S conftest | fgrep INIT_ARRAY > /dev/null; then
1309 libc_cv_initfini_array=yes
1311 libc_cv_initfini_array=no
1313 [libc_cv_initfini_array=no])
1315 if test $libc_cv_initfini_array != yes; then
1316 AC_MSG_ERROR([Need linker with .init_array/.fini_array support.])
1319 AC_CACHE_CHECK(whether to use .ctors/.dtors header and trailer,
1320 libc_cv_ctors_header, [dnl
1321 libc_cv_ctors_header=yes
1322 LIBC_TRY_LINK_STATIC([
1323 __attribute__ ((constructor)) void ctor (void) { asm (""); }
1324 __attribute__ ((destructor)) void dtor (void) { asm (""); }
1327 AS_IF([$READELF -WS conftest$ac_exeext | $AWK '
1328 { gsub(/\@<:@ */, "@<:@") }
1329 $2 == ".ctors" || $2 == ".dtors" {
1330 size = strtonum("0x" $6)
1331 align = strtonum("0x" $NF)
1333 stub@<:@$2@:>@ = size == align * 2
1336 ctors_ok = !seen@<:@".ctors"@:>@ || stub@<:@".ctors"@:>@
1337 dtors_ok = !seen@<:@".dtors"@:>@ || stub@<:@".dtors"@:>@
1338 exit ((ctors_ok && dtors_ok) ? 0 : 1)
1340 '], [libc_cv_ctors_header=no])
1342 AC_MSG_ERROR([missing __attribute__ ((constructor)) support??])
1345 if test $libc_cv_ctors_header = no; then
1346 AC_DEFINE(NO_CTORS_DTORS_SECTIONS)
1349 AC_CACHE_CHECK(for libunwind-support in compiler,
1350 libc_cv_cc_with_libunwind, [
1351 cat > conftest.c <<EOF
1352 int main (void) { return 0; }
1354 if ${CC-cc} $CFLAGS $CPPFLAGS $LDFLAGS -static -o conftest \
1355 conftest.c -v 2>&1 >/dev/null | grep ' -lunwind ' >/dev/null; then
1356 libc_cv_cc_with_libunwind=yes
1358 libc_cv_cc_with_libunwind=no
1361 AC_SUBST(libc_cv_cc_with_libunwind)
1362 if test $libc_cv_cc_with_libunwind = yes; then
1363 AC_DEFINE(HAVE_CC_WITH_LIBUNWIND)
1366 LIBC_LINKER_FEATURE([-z nodelete], [-Wl,--enable-new-dtags,-z,nodelete],
1367 [libc_cv_z_nodelete=yes],
1368 [AC_MSG_ERROR(linker with -z nodelete support required)])
1370 LIBC_LINKER_FEATURE([-z nodlopen], [-Wl,--enable-new-dtags,-z,nodlopen],
1371 [libc_cv_z_nodlopen=yes],
1372 [AC_MSG_ERROR(linker with -z nodlopen support required)])
1374 LIBC_LINKER_FEATURE([-z initfirst], [-Wl,--enable-new-dtags,-z,initfirst],
1375 [libc_cv_z_initfirst=yes],
1376 [AC_MSG_ERROR(linker with -z initfirst support required)])
1378 AC_CACHE_CHECK(for -Bgroup option,
1379 libc_cv_Bgroup, [dnl
1380 cat > conftest.c <<EOF
1381 int _start (void) { return 42; }
1383 if AC_TRY_COMMAND([${CC-cc} $CFLAGS $CPPFLAGS $LDFLAGS
1384 -fPIC -shared -o conftest.so conftest.c
1385 -Wl,-Bgroup -nostdlib 1>&AS_MESSAGE_LOG_FD])
1392 AC_SUBST(libc_cv_Bgroup)
1395 AC_CACHE_CHECK(whether --noexecstack is desirable for .S files,
1396 libc_cv_as_noexecstack, [dnl
1397 cat > conftest.c <<EOF
1400 if AC_TRY_COMMAND([${CC-cc} $CFLAGS $CPPFLAGS
1401 -S -o conftest.s conftest.c 1>&AS_MESSAGE_LOG_FD]) \
1402 && grep .note.GNU-stack conftest.s >/dev/null \
1403 && AC_TRY_COMMAND([${CC-cc} $ASFLAGS -Wa,--noexecstack
1404 -c -o conftest.o conftest.s 1>&AS_MESSAGE_LOG_FD])
1406 libc_cv_as_noexecstack=yes
1408 libc_cv_as_noexecstack=no
1411 if test $libc_cv_as_noexecstack = yes; then
1412 ASFLAGS_config="$ASFLAGS_config -Wa,--noexecstack"
1414 AC_SUBST(ASFLAGS_config)
1416 AC_CACHE_CHECK(for -z combreloc,
1417 libc_cv_z_combreloc, [dnl
1418 cat > conftest.c <<EOF
1419 extern int bar (int);
1421 int foo (void) { return bar (mumble); }
1423 if AC_TRY_COMMAND([${CC-cc} $CFLAGS $CPPFLAGS $LDFLAGS
1424 -fPIC -shared -o conftest.so conftest.c
1425 -nostdlib -nostartfiles
1426 -Wl,-z,combreloc 1>&AS_MESSAGE_LOG_FD])
1428 dnl The following test is a bit weak. We must use a tool which can test
1429 dnl cross-platform since the gcc used can be a cross compiler. Without
1430 dnl introducing new options this is not easily doable. Instead use a tool
1431 dnl which always is cross-platform: readelf. To detect whether -z combreloc
1432 dnl look for a section named .rel.dyn.
1433 if $READELF -S conftest.so | grep '\.rel\(a\|\)\.dyn' > /dev/null; then
1434 libc_cv_z_combreloc=yes
1436 libc_cv_z_combreloc=no
1439 libc_cv_z_combreloc=no
1442 if test "$libc_cv_z_combreloc" = yes; then
1443 AC_DEFINE(HAVE_Z_COMBRELOC)
1445 AC_SUBST(libc_cv_z_combreloc)
1447 LIBC_LINKER_FEATURE([-z execstack], [-Wl,-z,execstack],
1448 [libc_cv_z_execstack=yes], [libc_cv_z_execstack=no])
1449 AC_SUBST(libc_cv_z_execstack)
1451 AC_CACHE_CHECK(for -fpie, libc_cv_fpie, [dnl
1452 LIBC_TRY_CC_OPTION([-fpie], [libc_cv_fpie=yes], [libc_cv_fpie=no])
1455 AC_SUBST(libc_cv_fpie)
1457 AC_CACHE_CHECK(for --hash-style option,
1458 libc_cv_hashstyle, [dnl
1459 cat > conftest.c <<EOF
1460 int _start (void) { return 42; }
1462 if AC_TRY_COMMAND([${CC-cc} $CFLAGS $CPPFLAGS $LDFLAGS
1463 -fPIC -shared -o conftest.so conftest.c
1464 -Wl,--hash-style=both -nostdlib 1>&AS_MESSAGE_LOG_FD])
1466 libc_cv_hashstyle=yes
1468 libc_cv_hashstyle=no
1471 AC_SUBST(libc_cv_hashstyle)
1473 # The linker's default -shared behavior is good enough if it
1474 # does these things that our custom linker scripts ensure that
1475 # all allocated NOTE sections come first.
1476 if test "$use_default_link" = default; then
1477 AC_CACHE_CHECK([for sufficient default -shared layout],
1478 libc_cv_use_default_link, [dnl
1479 libc_cv_use_default_link=no
1480 cat > conftest.s <<\EOF
1481 .section .note.a,"a",%note
1486 .section .note.b,"a",%note
1492 if AC_TRY_COMMAND([dnl
1493 ${CC-cc} $ASFLAGS -shared -o conftest.so conftest.s 1>&AS_MESSAGE_LOG_FD]) &&
1494 ac_try=`$READELF -S conftest.so | sed -n \
1496 s/^ *\[ *[1-9][0-9]*\] *\([^ ][^ ]*\) *\([^ ][^ ]*\) .*$/\2 \1/
1502 libc_seen_a=no libc_seen_b=no
1504 while test $# -ge 2 -a "$1" = NOTE; do
1506 .note.a) libc_seen_a=yes ;;
1507 .note.b) libc_seen_b=yes ;;
1511 case "$libc_seen_a$libc_seen_b" in
1513 libc_cv_use_default_link=yes
1516 echo >&AS_MESSAGE_LOG_FD "\
1517 $libc_seen_a$libc_seen_b from:
1523 use_default_link=$libc_cv_use_default_link
1526 AC_CACHE_CHECK(linker output format, libc_cv_output_format, [dnl
1527 if libc_cv_output_format=`
1528 ${CC-cc} -nostartfiles -nostdlib -Wl,--print-output-format 2>&AS_MESSAGE_LOG_FD`
1532 libc_cv_output_format=
1534 test -n "$libc_cv_output_format" || libc_cv_output_format=unknown])
1535 AC_SUBST(libc_cv_output_format)
1537 AC_CACHE_CHECK(for -fno-toplevel-reorder -fno-section-anchors, libc_cv_fno_toplevel_reorder, [dnl
1538 cat > conftest.c <<EOF
1541 if AC_TRY_COMMAND([${CC-cc} $CFLAGS $CPPFLAGS -S -fno-toplevel-reorder -fno-section-anchors
1542 conftest.c 1>&AS_MESSAGE_LOG_FD])
1544 libc_cv_fno_toplevel_reorder=yes
1546 libc_cv_fno_toplevel_reorder=no
1549 if test $libc_cv_fno_toplevel_reorder = yes; then
1550 fno_unit_at_a_time="-fno-toplevel-reorder -fno-section-anchors"
1552 fno_unit_at_a_time=-fno-unit-at-a-time
1554 AC_SUBST(fno_unit_at_a_time)
1556 AC_CACHE_CHECK(for -fstack-protector, libc_cv_ssp, [dnl
1557 LIBC_TRY_CC_OPTION([$CFLAGS $CPPFLAGS -Werror -fstack-protector],
1561 AC_SUBST(libc_cv_ssp)
1563 AC_CACHE_CHECK(for -fgnu89-inline, libc_cv_gnu89_inline, [dnl
1564 cat > conftest.c <<EOF
1566 #ifdef __GNUC_GNU_INLINE__
1567 main () { return 0;}
1572 if AC_TRY_COMMAND([${CC-cc} $CFLAGS $CPPFLAGS -S -std=gnu99 -fgnu89-inline
1573 -o conftest.s conftest.c 1>&AS_MESSAGE_LOG_FD])
1575 libc_cv_gnu89_inline=yes
1577 libc_cv_gnu89_inline=no
1580 if test $libc_cv_gnu89_inline = yes; then
1581 gnu89_inline=-fgnu89-inline
1585 AC_SUBST(gnu89_inline)
1587 AC_CACHE_CHECK(whether cc puts quotes around section names,
1588 libc_cv_have_section_quotes,
1589 [cat > conftest.c <<EOF
1590 static const int foo
1591 __attribute__ ((section ("bar"))) = 1;
1593 if ${CC-cc} -S conftest.c -o conftest.s; then
1594 if grep '\.section.*"bar"' conftest.s >/dev/null; then
1595 libc_cv_have_section_quotes=yes
1597 libc_cv_have_section_quotes=no
1600 libc_cv_have_section_quotes=unknown
1602 rm -f conftest.{c,s}
1604 if test $libc_cv_have_section_quotes = yes; then
1605 AC_DEFINE(HAVE_SECTION_QUOTES)
1608 AC_CACHE_CHECK(for assembler .weak directive, libc_cv_asm_weak_directive,
1610 cat > conftest.s <<EOF
1615 .weak bar; bar = foo
1617 if AC_TRY_COMMAND(${CC-cc} $ASFLAGS -c conftest.s 1>&AS_MESSAGE_LOG_FD); then
1618 libc_cv_asm_weak_directive=yes
1620 libc_cv_asm_weak_directive=no
1624 if test $libc_cv_asm_weak_directive = no; then
1625 AC_CACHE_CHECK(for assembler .weakext directive,
1626 libc_cv_asm_weakext_directive,
1628 cat > conftest.s <<EOF
1637 if AC_TRY_COMMAND(${CC-cc} $ASFLAGS -c conftest.s 1>&AS_MESSAGE_LOG_FD); then
1638 libc_cv_asm_weakext_directive=yes
1640 libc_cv_asm_weakext_directive=no
1646 if test $libc_cv_asm_weak_directive = yes; then
1647 AC_DEFINE(HAVE_ASM_WEAK_DIRECTIVE)
1648 elif test $libc_cv_asm_weakext_directive = yes; then
1649 AC_DEFINE(HAVE_ASM_WEAKEXT_DIRECTIVE)
1652 AC_CACHE_CHECK(for ld --no-whole-archive, libc_cv_ld_no_whole_archive, [dnl
1653 cat > conftest.c <<\EOF
1658 dnl No \ in command here because it ends up inside ''.
1659 if AC_TRY_COMMAND([${CC-cc} $CFLAGS $CPPFLAGS $LDFLAGS
1660 -nostdlib -nostartfiles -Wl,--no-whole-archive
1661 -o conftest conftest.c 1>&AS_MESSAGE_LOG_FD]); then
1662 libc_cv_ld_no_whole_archive=yes
1664 libc_cv_ld_no_whole_archive=no
1667 if test $libc_cv_ld_no_whole_archive = no; then
1668 AC_MSG_ERROR([support for --no-whole-archive is needed])
1671 AC_CACHE_CHECK(for gcc -fexceptions, libc_cv_gcc_exceptions, [dnl
1672 cat > conftest.c <<\EOF
1677 dnl No \ in command here because it ends up inside ''.
1678 if AC_TRY_COMMAND([${CC-cc} $CFLAGS $CPPFLAGS $LDFLAGS
1679 -nostdlib -nostartfiles -fexceptions
1680 -o conftest conftest.c 1>&AS_MESSAGE_LOG_FD]); then
1681 libc_cv_gcc_exceptions=yes
1683 libc_cv_gcc_exceptions=no
1686 if test $libc_cv_gcc_exceptions = yes; then
1687 exceptions=-fexceptions
1689 AC_SUBST(exceptions)dnl
1691 AC_CACHE_CHECK(for __builtin_memset, libc_cv_gcc_builtin_memset, [dnl
1692 cat > conftest.c <<\EOF
1695 __builtin_memset (x, 0, 1000);
1699 if AC_TRY_COMMAND([${CC-cc} -O3 -S conftest.c -o - | fgrep "memset" > /dev/null]);
1701 libc_cv_gcc_builtin_memset=no
1703 libc_cv_gcc_builtin_memset=yes
1706 if test "$libc_cv_gcc_builtin_memset" = yes ; then
1707 AC_DEFINE(HAVE_BUILTIN_MEMSET)
1710 AC_CACHE_CHECK(for redirection of built-in functions, libc_cv_gcc_builtin_redirection, [dnl
1711 cat > conftest.c <<\EOF
1712 extern char *strstr (const char *, const char *) __asm ("my_strstr");
1713 char *foo (const char *a, const char *b)
1715 return __builtin_strstr (a, b);
1719 if AC_TRY_COMMAND([${CC-cc} -O3 -S conftest.c -o - | fgrep "my_strstr" > /dev/null]);
1721 libc_cv_gcc_builtin_redirection=yes
1723 libc_cv_gcc_builtin_redirection=no
1726 if test "$libc_cv_gcc_builtin_redirection" = no; then
1727 AC_MSG_ERROR([support for the symbol redirection needed])
1730 dnl Check whether the compiler supports the __thread keyword.
1731 AC_CACHE_CHECK([for __thread], libc_cv_gcc___thread,
1732 [cat > conftest.c <<\EOF
1733 __thread int a = 42;
1735 if AC_TRY_COMMAND([${CC-cc} $CFLAGS $CPPFLAGS -c conftest.c >&AS_MESSAGE_LOG_FD]); then
1736 libc_cv_gcc___thread=yes
1738 libc_cv_gcc___thread=no
1741 if test "$libc_cv_gcc___thread" = no; then
1742 AC_MSG_ERROR([support for the __thread keyword is required])
1745 dnl Check whether the compiler supports the tls_model attribute.
1746 AC_CACHE_CHECK([for tls_model attribute], libc_cv_gcc_tls_model_attr, [dnl
1747 cat > conftest.c <<\EOF
1748 extern __thread int a __attribute__((tls_model ("initial-exec")));
1750 if AC_TRY_COMMAND([${CC-cc} $CFLAGS $CPPFLAGS -S -Werror conftest.c >&AS_MESSAGE_LOG_FD]); then
1751 libc_cv_gcc_tls_model_attr=yes
1753 libc_cv_gcc_tls_model_attr=no
1756 if test "$libc_cv_gcc_tls_model_attr" = no; then
1757 AC_MSG_ERROR([support for the tls_model attribute is required])
1760 dnl Determine how to disable generation of FMA instructions.
1761 AC_CACHE_CHECK([for compiler option to disable generation of FMA instructions],
1762 libc_cv_cc_nofma, [dnl
1764 for opt in -ffp-contract=off -mno-fused-madd; do
1765 LIBC_TRY_CC_OPTION([$opt], [libc_cv_cc_nofma=$opt; break])
1767 AC_SUBST(libc_cv_cc_nofma)
1769 if test -n "$submachine"; then
1770 AC_CACHE_CHECK([for compiler option for CPU variant],
1771 libc_cv_cc_submachine, [dnl
1772 libc_cv_cc_submachine=no
1773 for opt in "-march=$submachine" "-mcpu=$submachine"; do
1774 LIBC_TRY_CC_OPTION([$opt], [
1775 libc_cv_cc_submachine="$opt"
1778 if test "x$libc_cv_cc_submachine" = xno; then
1779 AC_MSG_ERROR([${CC-cc} does not support $submachine])
1782 AC_SUBST(libc_cv_cc_submachine)
1784 AC_CACHE_CHECK(if $CC accepts -fno-tree-loop-distribute-patterns with \
1785 __attribute__ ((__optimize__)), libc_cv_cc_loop_to_function, [dnl
1786 cat > conftest.c <<EOF
1788 __attribute__ ((__optimize__ ("-fno-tree-loop-distribute-patterns")))
1791 libc_cv_cc_loop_to_function=no
1792 if AC_TRY_COMMAND([${CC-cc} $CFLAGS $CPPFLAGS -c conftest.c])
1794 libc_cv_cc_loop_to_function=yes
1797 if test $libc_cv_cc_loop_to_function = yes; then
1798 AC_DEFINE(HAVE_CC_INHIBIT_LOOP_TO_LIBCALL)
1800 AC_SUBST(libc_cv_cc_loop_to_function)
1802 dnl Check whether we have the gd library available.
1803 AC_MSG_CHECKING(for libgd)
1804 if test "$with_gd" != "no"; then
1805 old_CFLAGS="$CFLAGS"
1806 CFLAGS="$CFLAGS $libgd_include"
1807 old_LDFLAGS="$LDFLAGS"
1808 LDFLAGS="$LDFLAGS $libgd_ldflags"
1810 LIBS="$LIBS -lgd -lpng -lz -lm"
1811 AC_TRY_LINK([#include <gd.h>], [gdImagePng (0, 0)], LIBGD=yes, LIBGD=no)
1812 CFLAGS="$old_CFLAGS"
1813 LDFLAGS="$old_LDFLAGS"
1818 AC_MSG_RESULT($LIBGD)
1822 if test x$with_selinux = xno ; then
1825 # See if we have the SELinux library
1826 AC_CHECK_LIB(selinux, is_selinux_enabled,
1827 have_selinux=yes, have_selinux=no)
1828 if test x$with_selinux = xyes ; then
1829 if test x$have_selinux = xno ; then
1830 AC_MSG_ERROR([SELinux explicitly required, but SELinux library not found])
1834 # Check if we're building with SELinux support.
1835 if test "x$have_selinux" = xyes; then
1836 AC_DEFINE(HAVE_SELINUX, 1, [SELinux support])
1838 # See if we have the libaudit library
1839 AC_CHECK_LIB(audit, audit_log_user_avc_message,
1840 have_libaudit=yes, have_libaudit=no)
1841 if test "x$have_libaudit" = xyes; then
1842 AC_DEFINE(HAVE_LIBAUDIT, 1, [SELinux libaudit support])
1844 AC_SUBST(have_libaudit)
1846 # See if we have the libcap library
1847 AC_CHECK_LIB(cap, cap_init, have_libcap=yes, have_libcap=no)
1848 if test "x$have_libcap" = xyes; then
1849 AC_DEFINE(HAVE_LIBCAP, 1, [SELinux libcap support])
1851 AC_SUBST(have_libcap)
1853 AC_SUBST(have_selinux)
1855 dnl check for the size of 'long double'.
1856 AC_CHECK_SIZEOF(long double, 0)
1857 sizeof_long_double=$ac_cv_sizeof_long_double
1858 AC_SUBST(sizeof_long_double)
1861 dnl Check for silly hacked compilers predefining _FORTIFY_SOURCE.
1862 dnl Since we are building the implementations of the fortified functions here,
1863 dnl having the macro defined interacts very badly.
1864 AC_CACHE_CHECK([for _FORTIFY_SOURCE predefine], libc_cv_predef_fortify_source,
1865 [AC_TRY_COMPILE([], [
1866 #ifdef _FORTIFY_SOURCE
1869 [libc_cv_predef_fortify_source=no],
1870 [libc_cv_predef_fortify_source=yes])])
1871 if test $libc_cv_predef_fortify_source = yes; then
1872 CPPUNDEFS="${CPPUNDEFS:+$CPPUNDEFS }-U_FORTIFY_SOURCE"
1876 dnl Check for silly hacked compilers inserting -fstack-protector.
1877 dnl This breaks badly for the early startup code we compile, since
1878 dnl the compiled code can refer to a magic machine-dependent location
1879 dnl for the canary value before we have sufficient setup for that to
1880 dnl work. It's also questionable to build all of libc with this flag
1881 dnl even when you're doing that for most applications you build, since
1882 dnl libc's code is so heavily-used and performance-sensitive. If we
1883 dnl ever really want to make that work, it should be enabled explicitly
1884 dnl in the libc build, not inherited from implicit compiler settings.
1885 AC_CACHE_CHECK([whether $CC implicitly enables -fstack-protector],
1886 libc_cv_predef_stack_protector, [
1887 AC_TRY_COMPILE([extern void foobar (char *);],
1888 [char large_array[2048]; foobar (large_array);], [
1889 libc_undefs=`$NM -u conftest.o |
1890 LC_ALL=C $AWK '$1 == "U" { print $2 | "sort -u"; next } { exit(1) }' \
1891 2>&AS_MESSAGE_LOG_FD` || {
1892 AC_MSG_ERROR([confusing output from $NM -u])
1894 echo >&AS_MESSAGE_LOG_FD "libc_undefs='$libc_undefs'"
1895 # On some architectures, there are architecture-specific undefined
1896 # symbols (resolved by the linker), so filter out unknown symbols.
1897 # This will fail to produce the correct result if the compiler
1898 # defaults to -fstack-protector but this produces an undefined symbol
1899 # other than __stack_chk_fail. However, compilers like that have not
1900 # been encountered in practice.
1901 libc_undefs=`echo "$libc_undefs" | egrep '^(foobar|__stack_chk_fail)$'`
1902 case "$libc_undefs" in
1903 foobar) libc_cv_predef_stack_protector=no ;;
1905 foobar') libc_cv_predef_stack_protector=yes ;;
1906 *) AC_MSG_ERROR([unexpected symbols in test: $libc_undefs]) ;;
1908 [AC_MSG_ERROR([test compilation failed])])
1911 if test $libc_cv_predef_stack_protector = yes; then
1912 libc_extra_cflags="$libc_extra_cflags -fno-stack-protector"
1914 libc_extra_cppflags=
1916 # Some linkers on some architectures support __ehdr_start but with
1917 # bugs. Make sure usage of it does not create relocations in the
1918 # output (as the linker should resolve them all for us).
1919 AC_CACHE_CHECK([whether the linker provides working __ehdr_start],
1920 libc_cv_ehdr_start, [
1921 old_CFLAGS="$CFLAGS"
1922 old_LDFLAGS="$LDFLAGS"
1924 CFLAGS="$CFLAGS -fPIC"
1925 LDFLAGS="$LDFLAGS -nostdlib -nostartfiles -shared"
1927 AC_LINK_IFELSE([AC_LANG_SOURCE([
1932 extern const Ehdr __ehdr_start __attribute__ ((visibility ("hidden")));
1933 long ehdr (void) { return __ehdr_start.val; }
1935 [if $READELF -r conftest | fgrep __ehdr_start >/dev/null; then
1936 libc_cv_ehdr_start=broken
1938 libc_cv_ehdr_start=yes
1939 fi], [libc_cv_ehdr_start=no])
1940 CFLAGS="$old_CFLAGS"
1941 LDFLAGS="$old_LDFLAGS"
1944 if test "$libc_cv_ehdr_start" = yes; then
1945 AC_DEFINE([HAVE_EHDR_START])
1946 elif test "$libc_cv_ehdr_start" = broken; then
1947 AC_MSG_WARN([linker is broken -- you should upgrade])
1950 AC_CACHE_CHECK(for __builtin_trap with no external dependencies,
1951 libc_cv_builtin_trap, [dnl
1952 libc_cv_builtin_trap=no
1953 AC_TRY_COMPILE([], [__builtin_trap ()], [
1954 libc_undefs=`$NM -u conftest.o |
1955 LC_ALL=C $AWK '$1 == "U" { print $2 | "sort -u"; next } { exit(1) }' \
1956 2>&AS_MESSAGE_LOG_FD` || {
1957 AC_MSG_ERROR([confusing output from $NM -u])
1959 echo >&AS_MESSAGE_LOG_FD "libc_undefs='$libc_undefs'"
1960 if test -z "$libc_undefs"; then
1961 libc_cv_builtin_trap=yes
1963 if test $libc_cv_builtin_trap = yes; then
1964 AC_DEFINE([HAVE_BUILTIN_TRAP])
1967 dnl C++ feature tests.
1970 AC_CACHE_CHECK([whether the C++ compiler supports thread_local],
1971 libc_cv_cxx_thread_local, [
1972 old_CXXFLAGS="$CXXFLAGS"
1973 CXXFLAGS="$CXXFLAGS -std=gnu++11"
1974 AC_COMPILE_IFELSE([AC_LANG_SOURCE([
1977 // Compiler support.
1984 S * get () { return &s; }
1986 // libstdc++ support.
1987 #ifndef _GLIBCXX_HAVE___CXA_THREAD_ATEXIT_IMPL
1988 #error __cxa_thread_atexit_impl not supported
1991 [libc_cv_cxx_thread_local=yes],
1992 [libc_cv_cxx_thread_local=no])
1993 CXXFLAGS="$old_CXXFLAGS"
1995 AC_SUBST(libc_cv_cxx_thread_local)
1998 dnl End of C++ feature tests.
2000 ### End of automated tests.
2001 ### Now run sysdeps configure fragments.
2003 # They also can set these variables.
2005 ldd_rewrite_script=no
2006 libc_cv_sysconfdir=$sysconfdir
2007 libc_cv_localstatedir=$localstatedir
2008 libc_cv_gcc_unwind_find_fde=no
2011 # Iterate over all the sysdep directories we will use, running their
2012 # configure fragments.
2013 for dir in $sysnames; do
2016 *) dest=$srcdir/$dir ;;
2018 if test -r $dest/configure; then
2019 AC_MSG_RESULT(running configure fragment for $dir)
2024 if test x"$build_mathvec" = xnotset; then
2027 LIBC_CONFIG_VAR([build-mathvec], [$build_mathvec])
2029 AC_SUBST(libc_extra_cflags)
2030 AC_SUBST(libc_extra_cppflags)
2032 if test x$libc_cv_gcc_unwind_find_fde = xyes; then
2033 AC_DEFINE(EXPORT_UNWIND_FIND_FDE)
2035 AC_SUBST(libc_cv_gcc_unwind_find_fde)
2037 # A sysdeps configure fragment can reset this if IFUNC is not actually
2038 # usable even though the assembler knows how to generate the symbol type.
2039 if test x"$libc_cv_ld_gnu_indirect_function" = xyes; then
2040 AC_DEFINE(HAVE_IFUNC)
2043 # This is far from the AC_ARG_ENABLE that sets it so that a sysdeps
2044 # configure fragment can override the value to prevent this AC_DEFINE.
2046 if test "x$use_nscd" != xno; then
2047 AC_DEFINE([USE_NSCD])
2049 if test "x$build_nscd" = xdefault; then
2050 build_nscd=$use_nscd
2053 # Test for old glibc 2.0.x headers so that they can be removed properly
2054 # Search only in includedir.
2055 AC_MSG_CHECKING(for old glibc 2.0.x headers)
2056 if eval test -f "${includedir}/elfclass.h" -a -f "${includedir}/fcntlbits.h"
2058 old_glibc_headers=yes
2060 old_glibc_headers=no
2062 AC_MSG_RESULT($old_glibc_headers)
2063 if test ${old_glibc_headers} = yes; then
2064 AC_MSG_WARN(*** During \"make install\" old headers from glibc 2.0.x will)
2065 AC_MSG_WARN(*** be removed.)
2067 AC_SUBST(old_glibc_headers)
2069 AC_SUBST(libc_cv_slibdir)
2070 AC_SUBST(libc_cv_rtlddir)
2071 AC_SUBST(libc_cv_localedir)
2072 AC_SUBST(libc_cv_sysconfdir)
2073 AC_SUBST(libc_cv_localstatedir)
2074 AC_SUBST(libc_cv_rootsbindir)
2075 AC_SUBST(libc_cv_forced_unwind)
2077 if test x$use_ldconfig = xyes; then
2078 AC_DEFINE(USE_LDCONFIG)
2080 AC_SUBST(use_ldconfig)
2081 AC_SUBST(ldd_rewrite_script)
2086 AC_CACHE_CHECK([whether -fPIC is default], libc_cv_pic_default,
2087 [libc_cv_pic_default=yes
2088 cat > conftest.c <<EOF
2089 #if defined __PIC__ || defined __pic__ || defined PIC || defined pic
2090 # error PIC is default.
2093 if eval "${CC-cc} -S conftest.c 2>&AS_MESSAGE_LOG_FD 1>&AS_MESSAGE_LOG_FD"; then
2094 libc_cv_pic_default=no
2097 AC_SUBST(libc_cv_pic_default)
2099 AC_CACHE_CHECK([whether -fPIE is default], libc_cv_pie_default,
2100 [libc_cv_pie_default=yes
2101 cat > conftest.c <<EOF
2102 #if defined __PIE__ || defined __pie__ || defined PIE || defined pie
2103 # error PIE is default.
2106 if eval "${CC-cc} -S conftest.c 2>&AS_MESSAGE_LOG_FD 1>&AS_MESSAGE_LOG_FD"; then
2107 libc_cv_pie_default=no
2110 AC_SUBST(libc_cv_pie_default)
2113 AC_SUBST(static_nss)
2117 dnl See sysdeps/mach/configure.ac for this variable.
2118 AC_SUBST(mach_interface_list)
2120 VERSION=`sed -n -e 's/^#define VERSION "\([^"]*\)"/\1/p' < $srcdir/version.h`
2121 RELEASE=`sed -n -e 's/^#define RELEASE "\([^"]*\)"/\1/p' < $srcdir/version.h`
2125 AC_CONFIG_FILES([config.make Makefile])
2126 AC_CONFIG_COMMANDS([default],[[
2127 case $CONFIG_FILES in *config.make*)
2128 echo "$config_vars" >> config.make;;
2130 test -d bits || mkdir bits]],[[config_vars='$config_vars']])